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Electrical Machines

Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 1
 8
 2
 4

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Electrical Machines
If field current is decreased in shunt dc motor, the speed of the motor

 remains same.
 increases.
None of these
 decreases.

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Electrical Machines
The DC compound motors are generally

 Cummulative compound.
 Differentical compound.
 Level Compound.
 None of these.

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. The highest speed of the alternators is

  500 rpm.
  3600 rpm.
  600 rpm.
  3000 rpm.

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Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is

 460 V.
 115 V.
 200 V.
 230 V.

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Electrical Machines
Which of the following motor is suitable for frequent starting and stoppings?

 Capacitor start motor
All of these
 Resistance split phase motor
 Capacitor start capacitor run motor

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